Dims: 0.8x0.4x0.3" (2.0x1.0x0.8 cm)
Wt: 14.80 ct (2.96 g)
Thomas Range, Utah, USA
This thumbnail specimen of topaz consists mostly of a single large crystal. It is well formed and shows no damage, although 4 of the prismatic termination faces are frosted - all other faces of this crystal are transparent. The bottom of the crystal is covered by the rhyolite host rock and another thin topaz crystal. Under a loupe, one can see numerous tiny black (presumably bixbyite) crystals, both on the surface and inside the topaz.